A new worm purporting to contain a patch to defend against MyDoom is attacking Windows machines throughout Europe and parts of North America.
Sober.D appeared last week and began spreading in Germany and the United Kingdom. The worm arrives in an e-mail message with a subject line of "Microsoft Alert: Please Read!" and carries a sending address with a Microsoft domain. The domain extensions on the messages are typically from Germany, Israel, Switzerland or Austria.
The new worm comes a week after the most concentrated onslaught of virus activity in recent memory, which included the arrival of 16 new viruses within about 10 days.